What is the delay in 1D bar API?

Hi,

In the following Alpaca API call:

https://data.alpaca.markets/v1/bars/1D?symbols=GOOG

The last entry is alway the current day, with a timestamp of 00:00:00.

However, even if the last timestamp never change, the close and volume information change, which suggests that it is the last market values. I would like to confirm that. What is the delay?

cheers